:Gauthier Onclin

In January, Onclin reached the semifinals of the 2023 BW Open in Ottignies-Louvain-la-Neuve where he lost to eventual champion and compatriot David Goffin.{{cite web|accessdate=May 24, 2023|date=January 27, 2023|first=Grant|last=Thomoson|title=Goffin Leads Belgium's Star-Studded Challenger|url=https://www.atptour.com/en/news/challenger-tour-belgium-challenger-goffin-feature-2023}}

In May, he defeated the higher-ranked Elias Ymer at a Challenger event in Bordeaux in the first round.

{{Cite web|url=https://www.lavenir.net/sports/tennis/2023/05/16/challenger-de-bordeaux-gauthier-onclin-ecarte-elias-ymer-et-se-hisse-au-2e-tour-CQOCVC5I5ZAXJANFKRGDCWSMZE/|title= Challenger de Bordeaux : Gauthier Onclin écarte Elias Ymer et retrouvera Ugo Humbert au 2e tour |date=May 16, 2023|accessdate=May 24, 2023|website=Lavenir|language=fr}} At the 2023 French Open he defeated Nicholas David Ionel in straight sets in the first round of qualifying before losing to Argentine Thiago Agustin Tirante in three sets.{{cite web|title=Gauthier Onclin|url=https://www.rolandgarros.com/en-us/players/41448-g.onclin|website=Roland Garros|accessdate=28 June 2023}} Onclin got his revenge over the Argentine in the qualifying at the 2023 Wimbledon Championships, winning in straight sets during his first ever grass-court summer, as his junior years coincided with the grass-court portion of the Tour cancellation due to the COVID-19 pandemic.{{cite web|url=https://www.lavenir.net/sports/tennis/2023/06/26/gauthier-onclin-au-2e-tour-des-qualifs-a-wimbledon-je-navais-jamais-joue-sur-gazon-auparavant-2KYLC646F5A6PIWX3OAHYHWDXE/?outputType=amp|website=Lavenir|title= Gauthier Onclin, au 2e tour des qualifs à Wimbledon : "Je n'avais jamais joué sur gazon auparavant" |date=26 June 2023|accessdate=28 June 2023|language=fr}}

In October, he received a wildcard in doubles for the European Open in Antwerp, alongside compatriot Michael Geerts.{{cite web|url= https://www.fan2be.com/article.php?mode=news&id=4449 |website=fan2.be|accessdate=15 October 2023|title= Zizou Bergs dubbelt met Tibo Colson in Antwerpen |first=Johan|last=Mulders|date=15 October 2023|language=nl}} At the same tournament, in the qualifying singles competition, he defeated higher-ranked American Maxime Cressy.{{cite web|url=https://europeanopen.be/2023/10/15/blockx-bailly-and-onclin-one-step-closer-to-main-draw-after-wins/|website=Europeanopen.be|accessdate=16 October 2023|date=15 October 2023|title= BLOCKX, BAILLY AND ONCLIN ONE STEP CLOSER TO MAIN DRAW AFTER WINS}}

In May, Onclin reached his first Challenger final at the Prague Open. He lost to the former world No. 35 Jiří Veselý.{{cite web|language=fr|url=https://www.dhnet.be/dernieres-depeches/2024/05/12/challenger-de-prague-gauthier-onclin-battu-pour-sa-premiere-finale-sur-le-circuit-challenger-O5IBYFOJMVCKRI2WSOSFIWS7SQ/|website=dhnet.be|title=Challenger de Prague - Gauthier Onclin battu pour sa première finale sur le circuit Challenger|date=12 May 2024}}{{cite web|url=https://www.atptour.com/en/news/buyunchaokete-gerasimov-wuxi-challenger-2024-final|title=Bu, 22, makes Chinese tennis history; Pouille returns to Challenger titletown|publisher=ATPTour|accessdate=22 January 2025}} In October and November 2024 he reached two M25 finals in Portugal where he faced the same opponent, losing the first to Frederico Ferreira Silva but winning the second at the Vale do Lobo Open III.{{cite web|url= https://www.sulinformacao.pt/en/2024/11/portugues-frederico-silva-derrotado-na-final-do-vale-do-lobo-open-iii/|website=Sulinformacao.pt|accessdate=9 January 2025|title= Portuguese Frederico Silva defeated in the final of the Vale do Lobo Open III|date=24 November 2024}} He closed out 2024 with a second title in two weeks, and 12th ITF title, winning the M25 in Monastir, Tunisia, recording 10 consecutive victories on the ITF circuit.{{cite web|url= https://www.lalibre.be/dernieres-depeches/2024/12/01/itf-monastir-gauthier-onclin-remporte-son-12e-titre-itf-et-le-second-en-deux-semaines-2OKBILUDURGJ3CO72NBV5POI2E/|website=lalibre|accessdate=9 January 2025|title= ITF Monastir - Gauthier Onclin remporte son 12e titre ITF et le second en deux semaines |date=1 December 2024|language=fr}}

===2025: Grand Slam debut===

He started the season by increasing his 2024 winning streak to 13 matches {{cite web|url=https://www.itftennis.com/en/players/gauthier-onclin/800390641/bel/mt/s/activity/#pprofile-info-tabs |title=GO Activity}} after he made it through the qualifications at the 2025 Australian Open into the main draw for his Grand Slam debut, defeating Roman Andres Burruchaga and Americans Aleksandar Kovacevic and Mackenzie McDonald.{{cite web|url= https://www.dhnet.be/sports/tennis/2025/01/09/exploit-a-lopen-daustralie-gauthier-onclin-qualifie-pour-la-premiere-fois-pour-le-tableau-final-dun-grand-chelem-HYMISMP2XBFFJKIEUDYQ6NPFY4/|website=dhnet.be|accessdate=9 January 2025|title= Exploit à l'Open d'Australie : Gauthier Onclin qualifié pour la première fois pour le tableau final d'un Grand Chelem |date=9 January 2025|language=fr}} {{cite web|url=https://www.atptour.com/en/news/australian-open-2025-qualifying-r3 |title= Fonseca, Tien, Landaluce make history with Australian Open qualifying success |date=9 January 2025|website=ATPTour}}

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• {{ATP|o0a2}}
• {{ITF|gauthier-onclin/800390641/bel}}

{{Top male singles tennis players by country|BEL}}

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Category:2001 births

Category:Living people

Category:Belgian male tennis players

Category:Tennis players from Liège

Category:21st-century Belgian sportsmen